Reaction ball



FIG. 1 is a top view of the reaction ball showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front view thereof.

FIG. 4 is a right side view thereof; and,

FIG. 5 is a bottom view thereof. 

CLAIM I claim the ornamental design for a reaction ball, as shown and described. 